Ethereum developers will continue working on the existing chain to maintain its functionality ahead of Serenity
Source: https://cointelegraph.com/news/ethereum-1x-devs-focusing-on-stateless-clients-to-curb-chain-bloat
Ethereum 1.x Devs Focusing on ‘Stateless Clients’ to Curb Chain Bloat
January 18, 2020
CoinTelegraph